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Waterproof membrane cover for acoustic arrays in sodar systems

a technology of acoustic array and waterproof membrane, which is applied in the direction of volume metering, using reradiation, instruments, etc., can solve the problems of comparatively poor directionality, and achieve the effects of preventing or at least inhibiting dust collection, reducing the performance of the speaker, and adversely affecting the sensitive circui

Inactive Publication Date: 2013-01-08
VAISALA
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AI Technical Summary

Benefits of technology

The invention uses transducers with symmetrical actuators and horns, which results in a more uniform sound pressure across the front of the array. The hexagonal grid packing arrangement also reduces unwanted acoustic characteristics between the horns and sensitivity in receive mode to off-beam sounds. The membrane cover prevents moisture, dust, and insects from entering the array and damaging its components.

Problems solved by technology

Indeed, in rectangular grid array units the benefits from the inventive shaped housing might be as great, or greater than the benefits of a shaped housing for a hexagonal array, since such rectangular grid arrays have comparatively poorer directionality and hence more room for improvement.

Method used

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  • Waterproof membrane cover for acoustic arrays in sodar systems
  • Waterproof membrane cover for acoustic arrays in sodar systems
  • Waterproof membrane cover for acoustic arrays in sodar systems

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Embodiment Construction

[0062]Monostatic sodars employ sequential, directed beams of sound as part of their operation. Individual acoustic transducers typically emanate sound in a wide wavefront approximating the surface of a sphere, rendering them unsuitable for sodar use without a focusing mechanism. Array 10 of closely packed and evenly spaced transducers, FIG. 1, can accomplish focusing by producing a complex interfering pattern of wavefronts that effectively creates a principal beam that is narrower than that of an individual transducer. The angular spread of the beam is related to the number of transducers in the array: more transducers generally can create a narrower beam. Arrays of thirty-two to sixty transducers are usually adequate to produce beams that are narrow enough for sodar applications; array 10 has thirty-six transducers 12. Each transducer 12 has a circular actuator and horn. Transducers 12 are closely packed along a number of parallel rows (seven such rows in the non-limiting preferred...

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Abstract

A waterproof or water-resistant membrane cover for the acoustic transducer array of a sodar system. The membrane is placed over each transducer of the array. The membrane may be spaced from the array, with a structure such as a frame used to hold the membrane in place relative to the array.

Description

CROSS REFERENCE TO RELATED APPLICATIONS[0001]This application is a continuation in part of application Ser. No. 11 / 934,915, filed on Nov. 5, 2007. This application is also a continuation in part of application Ser. No. 12 / 117,994 filed on May 9, 2008. This application also claims priority of provisional patent application Ser. No. 60 / 941,387, filed on Jun. 1, 2007, and of provisional patent application Ser. No. 60 / 941,302, filed on Jun. 1, 2007. The entire disclosures of these four applications are incorporated herein by reference.FIELD OF THE INVENTION[0002]The present invention relates to a sonic detection and ranging (sodar) system.BACKGROUND OF THE INVENTION[0003]Sodar systems employ sound waves to detect atmospheric phenomena such as wind speed. A monostatic sodar operates by transmitting directional sound pulses and detecting reflected signals from a single apparatus; bistatic systems have separate transmitters and receivers. Phased-array monostatic sodars employ groups of aco...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): G01S15/02G01P5/00
CPCG01S15/885H04R1/086
Inventor LAWHITE, NIELSMANFREDI, LOUISSASS, WALTER L.
Owner VAISALA
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